Photo electric beam consisting of infrared transmitter/receiver. Useful for creating break beam alarms for doorways, garages, corridors etc. The FT25B is a two-part infrared beam system. The infrared
beam receiver is powered by 12V DC and is equipped with an output relay having
N/O N/C contacts. The infrared transmitter can be powered by either 12V DC or 2
x AA size 3.6V Lithium batteries. Battery life is over two years. Installation
is very quick and straight forward with easy beam alignment.